Understanding APSK and QAM Rohde and Schwarz video R&S , Useful series of videos covering aspects of radio This video is applicable to the VARA modem coding , makes sense of the displays - 73-Graham g

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File transfer issues with V-Chat version 1-2-4 resolved VARA Chat v1.2.5 Data limit is now 2MB per file 73-Graham g0nbd

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SDR latency is a little longer than conventional , But , as is , its not possible for , say, a two way connection , using , Flex SDR<> Flex SDR and the Chat module probably a case of unexpected conseq

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Ok James's Good question, The Trimode Dwell time of 4 seconds , is the 'only' limiting factor , preventing the deployment of SDR in a gateway which is perhaps a legacy issue .. Unlike 'fixed'/'static'

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Are Winlink aware of this issue? And do they plan to address it?

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VARA HF , TRI MODE and the SDR The use of SDR and the VARA HF modem is limited to , SDR one side of the connection only ie Conventional <> SDR , or SDR <> Conventional Where as VARA FM and VARA Sat ,

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QSP from VARA site, news of new features and functions . Some insight to the USAF adoption , round compression rates and BBS connect times , 73-Graham Jose EA5HVK 10 Apr 2021, 16:20:45 to VARA HF Mode

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Hi Sigi , The channel could be 2.9 k , the VTAC modem is 2.795 KHz but probably would not work, due to the circuit delays VSAT is based on the 2KHz b/w HF modem and supports the extended delay and pro

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Apparently it's 'listed in the beta version , not yet embodied in the current release. 73 Graham G0nbd

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Is selection of the new 2750 mode automatic? When I start my registered copy of Vara V4.3.0 with Winlink Express V1.5.33.0 the speed displayed below the Vara waterfall is 2300 and I cannot find a meth

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Good question Andy, Googling vara qso , did bring back a few hits , one is a winlk p2p net , not really a qso as such , there is a IO vara group with ~ 500 members , posting there might help , look to

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Interesting Andy Any of the VARA modes will run over FM link , during testing , with local station on 6 metres , who , was suffering from solar panel qrm , during the day, 'we found that switching to

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Yes Graham . I just received a private email from USA air force MARS person interested in testing VARA FM on MARS repeaters . Interesting idea . Andy

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an fm signal is way narrower as the tv datv signals is so you will have a way higher signal as the tv beacon (and other user will be a bit "pissed") ... on the other way if you lower your level to the

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I finally got around to installing VARA Chat today. I recall Jose's previous message stating VARA CHAT is good for emcomm use and not for CQ Hello Bye QSOs. However I had a QSO with someone via Olivia

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HNY Andy Yes , just the same as the other vara HF modes , the individual carrier rates are 42 baud , 300 never really made much sense, other than b/w linked to speed / rate , far to high to be robust

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HNY Sigi Well , AO-100 has wide and narrow band areas, there are already VARA SAT , which has extended AFC and some link delay measuring modules as well , will also work with any steam powered ssb set

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does this keep us in the USA "legal" in terms of FCC imposed baud rates. I can't remember those pesky rules ANdy K3UK

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hmm .. its a tad bit wide to be used on qo100 ;-) ... ok ok its vara HF ... not vara shf hi hi 100 to 2900 ... sure can you set that in your sdr setup (example a pluto) ... but we should not use more

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New VARA HF released 4-3-0 New for 2021 , additional 2750 Hz bandwidth mode added to the VARA family utilising available bandwidth, maximum rate is increased to 8489 Bps in 2750 Hz centered on 1500 Hz

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